Answer:
hormones
Explanation:
An example of materials commonly released this way is hormones. These are chemical messengers that are sent to the pituitary gland where they are released directly into the bloodstream. The blood then carries the hormones to different organs and tissues of the body in order to exert their specific function which varies depending on the specific type of hormones being secreted.
I might be incorrect, but from what I remember it should be particle size
<h3>The inner lining of the tube like systems possesses the ciliated epithelium. The cells bear shorter hair like projections called cilia which beat and allow the movement of the particles. The fallopian tubes are lined with cilia and vibrate to move the egg or the mucus in the cavity</h3>
